cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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iomap_copy.c (807B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2
      3#include <linux/export.h>
      4#include <linux/io.h>
      5
      6/**
      7 * __ioread64_copy - copy data from MMIO space, in 64-bit units
      8 * @to: destination (must be 64-bit aligned)
      9 * @from: source, in MMIO space (must be 64-bit aligned)
     10 * @count: number of 64-bit quantities to copy
     11 *
     12 * Copy data from MMIO space to kernel space, in units of 32 or 64 bits at a
     13 * time.  Order of access is not guaranteed, nor is a memory barrier
     14 * performed afterwards.
     15 */
     16void __ioread64_copy(void *to, const void __iomem *from, size_t count)
     17{
     18#ifdef CONFIG_64BIT
     19	u64 *dst = to;
     20	const u64 __iomem *src = from;
     21	const u64 __iomem *end = src + count;
     22
     23	while (src < end)
     24		*dst++ = __raw_readq(src++);
     25#else
     26	__ioread32_copy(to, from, count * 2);
     27#endif
     28}
     29EXPORT_SYMBOL_GPL(__ioread64_copy);